The greatest factor of stability of the hip joint comes from:
The size of the femur
The size of the muscles associated with the joint
The amount of articular cartilage at the end of the head of the femur
The depth of the acetabulum
The Correct Answer is D
Choice A reason: While the femur is a large and strong bone, its size alone does not contribute significantly to joint stability. Stability is more dependent on the structural configuration of the joint and surrounding tissues.
Choice B reason: Muscles around the hip joint, such as the gluteals and iliopsoas, contribute to movement and dynamic stability, but they are not the primary factor in maintaining joint integrity under load.
Choice C reason: Articular cartilage provides a smooth surface for joint movement and helps reduce friction, but it does not significantly enhance joint stability. Its role is more about cushioning and facilitating motion.
Choice D reason: The depth of the acetabulum is the most critical factor in hip joint stability. This deep socket securely houses the head of the femur, forming a ball-and-socket joint that resists dislocation and supports weight-bearing activities. The acetabular labrum further deepens the socket and enhances stability.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Perimysium surrounds bundles of muscle fibers known as fascicles, not individual muscle cells. It provides structural support and carries blood vessels and nerves.
Choice B reason: Epimysium is the outermost layer of connective tissue that surrounds the entire muscle. It does not envelop individual muscle cells.
Choice C reason: Endomysium is the correct answer. It is a thin layer of connective tissue that surrounds each individual muscle fiber (cell), providing structural integrity and facilitating capillary exchange.
Choice D reason: Myofibrils are intracellular structures within muscle cells that contain the contractile proteins actin and myosin. They are not connective tissue and do not surround muscle cells.
Correct Answer is A
Explanation
Choice A reason: The sarcomere is the smallest contractile unit of a skeletal muscle. It is composed of actin and myosin filaments arranged in a precise pattern that allows for muscle contraction. Sarcomeres are repeated along the length of a myofibril and are responsible for the striated appearance of skeletal muscle.
Choice B reason: The sarcoplasmic reticulum is a specialized form of endoplasmic reticulum in muscle cells that stores and releases calcium ions, which are essential for muscle contraction. However, it is not the contractile unit itself.
Choice C reason: The sarcolemma is the plasma membrane of a muscle fiber. It plays a role in conducting electrical signals but is not the structural unit responsible for contraction.
Choice D reason: A myofibril is a long, cylindrical organelle found within muscle cells that contains many sarcomeres. While it contributes to muscle contraction, it is composed of multiple sarcomeres and is not the fundamental unit.
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